- Aalways zero
- Bbetween 1 and $\infty$
- ✓between 0 and 1
- Dalways $\infty$
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A 220 volt, 1000 W bulb is connected across a 110 volt mains supply. The power consumed will be
|
(a) 1000 W |
(b) 750 W |
(c) 500 W |
(d) 250 W |
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
|
(a) 1.1 mA |
(b) 1.01 mA |
(c) 0.01 mA |
(d) 10 mA |
The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be
|
(a) E |
(b) E/4 |
(c) E/2 |
(d) 2E |
The laptop PC’s modern electronic watches and calculators use the following for display
|
(a) Single crystal |
(b) Poly crystal |
(c) Liquid crystal |
(d) Semiconductors |
What will happen when a 40 watt, 220 volt lamp and 100 watt, 220 volt lamp are connected in series across 40 volt supply
|
(a) 100 watt lamp will fuse |
(b) 40 watt lamp will fuse |
|
(c) Both lamps will fuse |
(d) Neither lamp will fuse |
Shift by which the object appears to be raised depends on: